diff --git a/bin/bcf_puppet_demo b/bin/bcf_puppet_demo
--- a/bin/bcf_puppet_demo
+++ b/bin/bcf_puppet_demo
@@ -5,12 +5,13 @@ tiny bcf2000 controller demo
 from bcf2000 import BCF2000
 from twisted.internet import reactor
 
+
 class PuppetSliders(BCF2000):
+
     def valueIn(self, name, value):
         if name == 'slider1':
             self.valueOut('slider5', value)
 
 
-
 b = PuppetSliders()
 reactor.run()